CVE-2020-25221

CVE-2020-25221 affects Linux kernel 5.7.x and 5.8.x before 5.8.7. The vulnerability arises in get_gate_page() implemented in mm/gup.c, due to incorrect reference counting of the backing struct page for the vsyscall page, causing a refcount underflow. It can be triggered by any 64-bit process that...